SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '908fb1dcdb787db9fb6f88f9f32024cf2e3ca284430d0515d3cd4b66e6900c2a' 
  AND token = 'PBjGYJsT44NzKr62Sk1flP9YoEs/HalBK6uxzPFhUuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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