Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e681807678d6a270346a3a293ef8723a4712312ee3cfa55f52889cfb0e74ddf' 
  AND token = '7m0DSR0Hne9w5LObVu+3Pf9UT/ionpi+NNJ/TfwrLQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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