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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bacc0f46898796eca1ff4c1fec86528a1cd36e5d1e6214a060c41432d1b374d' 
  AND token = 'ZjGvixX2c7nkvdu3lvmX2REW5x2EgwiYXlTkJ5dBwik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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