SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d447b341fedf5eb17d0d27c5433a52f99cb89f33eb6103d6d0cd765f476c405' 
  AND token = 'NgiKraC/1YHqVvQfFzmn30GGtdmhrEgCw+kilelfAG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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