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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c28ec18248c4dc1c9c93be77ce4fb33911c5cfb48d847efeeb05cb0eb1e1ff4' 
  AND token = 'KJ6GldmwBnj+MGhwKtpjnjZZtabQmNYnFbShP3/cCt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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