SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2693c97995adc04974cb174077478d64f53506addbebd37bf6035349029439c2' 
  AND token = 'ca3Wp09JOG7MficGCfVrPFwFWKC3sSqomZIzzh4XcwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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