SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579fffa03f69e77111386957a6d78db3b21897eda158041453c89ce20b4a73f2' 
  AND token = 'kuPEuGM3POZht1qA65LCA/hmlaidLtcD4idYlspeB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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