SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3226d89f3f1e15a1abb82462bf8460dc57497a0f59b8c13f8419355f38fab1ba' 
  AND token = 'jfv800qSILxj+T21+h5XouKnp4xHzVZVYa1nqNeJ6RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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