SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '414c2e5638ef9acaa76cb61061059f5af4a44221976b9eb33d932e3d1418fe72' 
  AND token = 'PynLxo0oCie5jjq0DJVro5l1tXwvQaC4uP7rGL6YqLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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