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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '142adabf0f4efdfa144d6accd0acd2f7562d2b8e5608fa52c0ae1ae10846c527' 
  AND token = 'OCQj3ApNUiHsXm/6F+Qz6QDeJekGyFckMXHtxyDtvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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