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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0f44df2f047184288d614de0d4497acb1c1ca3740f47008041cca54c3167b3' 
  AND token = 'xl6hgpxMBCBNB+z7s8fBs/ywy4Zc7FrOXbAe/q7/TgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}