Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb5616bef5c0d0fee3ac117eb2ae2234b35091c15f378062e297f0277ca2031c' 
  AND token = 'P4E1e+YTmNEHxHiqgWag2so47XJ8VvrKSDxO9IG3GD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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