SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79bc5caeb39ba4b41dea54e050f3c3765b2540f27646d12f03db7a61d58d9843' 
  AND token = '4TTwgMV/DAK/LJuiAsFKQYVrWeB8ENByvXdBrkOySko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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