SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b10002d2062407080ebab878656a1d9cf66c5ea33cb42563497f577459a706bc' 
  AND token = 'dtRg9bQV43ZlBIcdybLXDikxMBr+3PuA/GNqGssWh0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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