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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94bac4b6e8e620d797489b47c1fe97a8b3acd37f974c81bc553b8ac48dcd931c' 
  AND token = 'OrCaPsSvNvMZnpewf4t4A7LX/w+MZfuNR/kkU9sSM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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