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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb4d8f610a1691ebc5b7a5422ca7857de6e2981ccf7dd5e818b08e54ff0f5b0f' 
  AND token = '664DdVBnM+0X7vwlx2OOVNf+fJtp/iZMuf2W08wty0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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