SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6118a50e9819071f58f59e48433b8b8fe3072b45f3230a30a2f6cd161d1a4fcb' 
  AND token = 'GfWaUGpuN9Hl8VPB8OmYzgTGCGUiqjNibVnEgCddSxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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