SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7295be6eef8683f28fa1b6a9a695703621cc90c10d7d6c67d27267924e65311b' 
  AND token = 'zjWDJ0FYD12Gki2wUtah5Rrs2c7+ypIO5lmoKBu8Zt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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