SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b6038cb6f2920d0b2304b885d41c72ec3af1534c6c9ff38a8b540d529641a2e' 
  AND token = 'KOPstfBGVDErinzfEM3VRTfUkq6uwEPtjDmpCQCU7Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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