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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '478583b637f19d604a6948b8863b8c918972e8fe67dcf4fdee2468b058a27e11' 
  AND token = 'VeLp5UdzY7jBuGTzHJXfUMtx67+4S7GeQcCI61k+04o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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