SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd46393521e2cf93194471593d07bf7afc66072f372ec05228003948388b72f0' 
  AND token = 'xbFfGieVMIfxkRBRN5sb0JKGGLgjhLEtgB0wdI5VU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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