SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e81315b8c8ad4eb22151f421b6f18408129568e7ff379aac74160b12045da75' 
  AND token = '6WCy+K4sE47mIDVKer9DTjWwHlKGFq7QPpd0w/iYX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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