SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baccc12d5b6e0d5df6c09721a3e7f3f7eb4702756dbaa8d103e9ea484b39c80a' 
  AND token = 'vhquJr2lfm74wzmCMPGWCKyozXejM/f6mDLktEe9V8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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