SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba77f1d023e8a8a2cdf6f2a5a2697eb6bb5082e26525e6c5b69f4b5913594caa' 
  AND token = 'hZvqeSWaZ3LXvGIAJsIeyhJrtdwggmRdudol8p/Tq30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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