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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aab14093e4ce726d37c979f79db3a764f10f8cf9c4e848b187dab2ce0d68ab1' 
  AND token = 'bxtjVwuWWYzojkXRBD9+nxb27YIosKAyEDR7AFCR7yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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