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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d7b9df61597c744e1a1215c7130cca715443d1ae4def2f09f22cef75f6da91a' 
  AND token = 'pwWmxh3jtufKZ65txh7O74XayK1OoWvNS8DwoTWQ0ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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