SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c1f73c7453796d61c2d9013bc72d69003e8e61ba5dd5380062512f90df277d9' 
  AND token = 'uZ1HmPofwYd7/Khh3I+JburtIglbb7a8WNwlSLRtFVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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