SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc02c322442c5b729971979fee98ff00c04d3f5ad863c3ea312e63fbca9b20ca' 
  AND token = 'P686zZkJ3fyz95RugGl+v7BXzNxjIjF6V/406ToONU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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