SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19fcd9c7910aadea72721accd65db957e10d5eef861d433eef378cebda3fc624' 
  AND token = 'rtDEhrgNNY9IyvMzDnEKV8kG/ZgqomhX9Q3XFGXEssQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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