Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df1b0ace3a2d516738bad6e8b0b326dc75bf291e85768a23e06920fbaaf167aa' 
  AND token = 'PGBIueygXNhlH6EzBMP0YriWMq3Squ3ogt/1/OTkAAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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