SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf785868311e90b8909c0c6405d200159a71cd190c6322b38c6658ff9100b8a3' 
  AND token = '7oIiZI1kRk9hVPlibQgyvBzyKVsC6hU7sANV/D+FYII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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