SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53023478b9d6de43a0efaa348ab30fccd8aba666733ce7a52512e1371b8bfe15' 
  AND token = 'rPGA0lYuqc8IUYRCFmlKUsGHJ9TjmIe6D4BZ3IIOJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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