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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db854bf33b3531d7465ee903279d467a0777ccf77f1a4a6cf9a6f1b347060a67' 
  AND token = 'ZzFvIQWxIy/Py7fNidk1/ecz8mq6g7z4v3vydEdQxo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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