SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '960a54dac95ef7334ae2d9994c2072fddb272e6505bcc84a14ee6b57d7fb9489' 
  AND token = 'Mi1NeIktbFpCHHPmTTPgrz6/lw+dvSEDJtViGUQBBRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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