Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9be0a4e502f9a2501b0b273de1b49944957c204ac793015a17758f69be639fc' 
  AND token = 'ksVfQQOf2fGT2TdA/jag2i94A8sZdydiunWYfTyufFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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