Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5ed26ffe65bd3c2f351478ebe90861faac19b8724c683bea3409f3f1d031f5d' 
  AND token = '26bjZ1+OIkWhFlagrzsSSPx9ED9UqZFSdDspy08cuNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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