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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eead480fb22caa2c0d209385b2f8a03ab1fa23f139b3814c7c5eb071e7bcd5c6' 
  AND token = 'cyQqtYZ43ZGFC9Ygi0ur2uE5TW9gtzUK2klBjMigrCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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