Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '936db186c8bf26b389867ab2daef9ff8eb4dc1b51e168a439bbbffdd4fcb4e80' 
  AND token = 'K9jqrLGEDS8TmcNMQcMpkc+kXxtSgjuDx8G0uGzECYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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