SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ede4633fb11f20fba09881758ac16d2fef41f54726cd6ceda7a606fbb56da4d5' 
  AND token = '657G9QDLddHFjtBelyZ5lgqXqUYOT2liJYg4d5UzO/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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