Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8281077c5398a733b9989ed29df01631064da3586cc965e75a9cabc300b0c51' 
  AND token = 'V64DFhxe2cmZIuriorrz11KSgFtfPUXnHX6q0sON89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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