SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b44bd537ea04c9d6db3f0651ebbcdc89d0d944da6658d901ab67113579a2f42f' 
  AND token = 'YJIlWxcZQJOvsXccuh2t7wyPVQ3O8khhk1WsFvBrB90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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