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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfc9106c17b6d4d88dfe917fc248c704aab3dac9f4cd688437f15f53d5e3d05f' 
  AND token = 'r8Xk1FD2/Muwf3KpeCvBJxx0EH4FJmHAG3cMKd3AJl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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