SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8fd47efd0e1006277e5f62cafe8af431a3487649b5d01c101853d6fb197cd8d' 
  AND token = 'TqqYQNB75/BXelgb2ugYHSVWxqsVLCG1PuJdTD7XI40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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