SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '605444985252df750cead9798763c0f556f18823e593a67416b3df5170e4e1d4' 
  AND token = 'VyGI3zqARHln1CBBeATXwzKF6f6XTWxTQr07jXZtvQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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