Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756166d5e442e652a1617a2964603dd0904e99070e004bdf3e2df49266b1898c' 
  AND token = '8YthMO+HIVvSHEObi6fE1KKAZTFMVy6IVLl9evVs628=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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