SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b114f034696b94fcb568be0aa26f4742b81a3a3e7d6861dfafaf8075b79c667' 
  AND token = 'v+RrXp0UCaD/Pgz35Uf4Ye95rAV7YlLvQaRmwVU+QsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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