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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3055f65ea6cbc5caa7afbdcef3c45b47ff501c18605e667cd29cfeec7ac3039c' 
  AND token = '7ySIBeQiUKm0/Uk1gs8AMK+WnvhmBxrnibxMKwqGTpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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