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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0bf4772b17353251de019fc85dc78d7d943b6a1db7df35d11365da00025ce64' 
  AND token = 'fRh/VNNH4A4NfezLIeR4yUOl6SzYVyX+y8buNIBjHqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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