SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3871018af2d91d98f3559827bc0267745e8163b2870e36f8f4eb40f968f13af' 
  AND token = 'Bmn84dkYK9JfYhHiiVBmUu2iq4pdIZuE0Nk3agKeLU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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