SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440ab59fa73d008631cf7695f37ca33e4f9b1240fefad58952683d488dd262e9' 
  AND token = 's1mj1s1B1m+OVrpO+h4MwXqQ26S/W7sjqVDcf9CfBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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