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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9554f217f82004e73f662af4facc7f9e1cbe3c7ad534ca160910e3292526f10' 
  AND token = 'SHgLTQAh/WF4hCxJt4NHbylnvNzxWiRsv8S4ucgxbag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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