SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a76e6611f0c9e39022546b26288d3d97c67be06dccad7a3324ddb5e73659609e' 
  AND token = 'cOppJrna+YEHmgo8xQoLgXjPiFzsuCaiP+3/Xq9CRW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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