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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d61d9e250d5de039b711617a4001866ea4d7ec988d9c589cb64fd5375eb0c12' 
  AND token = '6E0SzVVzz8TUyYwS2XyhjTTWrxvBn7f9t/bXmtQjsu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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