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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6de42363c714b92deae2b5ef5cfe97c84ba056870101de409b0f83e198a47e0f' 
  AND token = 'cGILr8UnfFxIpcGdkrTGHuDpU83unujR6x89Uds51nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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