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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99ac10b4f688c2f102d9b61349b5bba7d16203d2dedaadc29af90686128b5385' 
  AND token = 'fIRhQ8VIF+H+HOJIX3kq79Gzca6kzUbEifUuHsFx6Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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