SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0207fefdf79d68fe830e12d7da46fcd21a7dee2aceaf343953316b214bbba876' 
  AND token = '0U5gB4dFF6Ir/UmuDFo2o+NvfKYlZ1ak9XsGx5C+hS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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