SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9b84bf67489fb2fc22ac30a688cbbe61d76bfb7aee88751d42938d2df1b9e22' 
  AND token = 'xxRQe58zymVQqOPpd+Gn8VFpY/ydZ2bcJl/dsPMZ0Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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