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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47c0d06a2eddd2c99fe03e2c8c55c23fc9f37d7065631cae6c6275128160f701' 
  AND token = 'sbN44df7Bs+OUk1TJoPXWqKrqsetUULeFFzGC2lOkLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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