Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b51430f931c2077e111ba91a04bf6fd87833ee85cdeac4efce7171747110b817' 
  AND token = 'ImjFd6Pqr/1bLDNJ9qyYxp35HpDMme13+aoQ51b8F1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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