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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f71646e1d11dc18570602baa39af7652928a011b13bc6adb25ddc8a8030d9a' 
  AND token = 'y6bijTEkxWHwZsr4Xat3/C/XoQBpl7w6aHip7QNRJhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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