SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd1ace1260c21507eed5cfa089d8d70f605822457b883e009bf5902b09f25713' 
  AND token = 'xzl9mq0tHKQRzYWoO/BizsMfZ5DuI7t+VfQ8/9AMgGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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