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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24b649c589c5c0e8310ce8113cca053d3620be5c19c584a7091f138dbd3a87bf' 
  AND token = 'y3Ab9ZHAa3XqnF8s1XKLH6MpE4gRAm5FSN44wro63RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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