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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56edcde222f15a8f8ee05294836048cea65df5b21e0f44d65e6d3bc99a2ddb99' 
  AND token = 'ocNUQVpKhz5pqwpVs3dFustdEe2OF1M7g19aAgVZpYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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