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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b50e23a9821bc60093cbcbcaac8f0b21fe7279162a53baebe836a6217284d93' 
  AND token = 'bW4/etz2R9gE2EslDjsFxlsmWUP7qHmqtuiMTWT5OxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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