SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f80df361422326f43c79e6f8cba1358ba82b7a3b3575dee93be7f6f026a1e6a' 
  AND token = 'gKDz4Qd/R4MHmojx9/K1NbynpcZim5HvVmBOOrxVZ+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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